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Uncover the best deals on Seattle to St Louis flights by comparing fares from hundreds of airlines and agencies.
Good to Know: Cheapest and Fastest SEA - STL Flights
Useful information for finding best airline tickets from Seattle Tacoma International to Lambert St Louis International on your next trip.
Cheapest Round Trip Flight
$330
Southwest Airlines
• 1 stop
• 16h 45m
May 01 – May 08
The cheapest round trip flight from Seattle to St Louis (SEA-STL-SEA) is currently $330
Cheapest One way Flight
$142
United Airlines
• 1 stop
• 15h 1m
Oct 16
The cheapest one way flight from Seattle to St Louis (SEA-STL) is currently $142
Fastest Flight
9h
The fastest nonstop flight from Seattle to St Louis (SEA-STL) takes 9h
Top Airlines Flying from Seattle to St Louis
Latest Flight Deals from Seattle (SEA) to St Louis (STL)
Compare and book low fare round-trip air tickets from Seattle to St Louis. Ideal for travelers with confirmed return itineraries.
May 01 - May 08, Economy
Seattle → St Louis
16h 45m
10:00 AM - 10:05 PM • 1 stop
Seattle → St Louis
10h 20m
6:00 AM - 10:20 AM • 1 stop
Southwest Airlines
May 01 - May 08, Economy
Seattle → St Louis
9h
1:00 PM - 8:40 PM • 1 stop
Seattle → St Louis
17h 10m
10:55 AM - 7:25 PM • 1 stop
Southwest Airlines
May 01 - May 08, Economy
Seattle → St Louis
10h 52m
11:45 AM - 8:37 PM • 1 stop
Seattle → St Louis
10h 25m
6:30 AM - 10:55 AM • 1 stop
Delta Airlines
May 01 - May 08, Economy
Seattle → St Louis
14h
6:05 AM - 4:45 PM • 1 stop
Seattle → St Louis
10h 5m
12:30 PM - 4:35 PM • 1 stop
Delta Airlines
Apr 30 - May 07, Economy
Seattle → St Louis
12h
5:20 AM - 2:40 PM • 1 stop
Seattle → St Louis
10h 20m
6:30 PM - 10:50 PM • 1 stop
Southwest Airlines
Explore competitive one-way airfare options for SEA - STL flights. Best suited for flexible or open-ended travel plans.
Flying to St Louis soon? We've surfaced some of the most affordable last-minute flights from Seattle to St Louis, ideal for urgent plans or spontaneous trips.
FAQs on Seattle to St Louis Flights
What are the airports in Seattle?
SEA
What’s the most popular airline flying from SEA to STL?
The most popular airline flying from Seattle to St Louis are
Can I fly from SEA to STL non-stop?
NO
Which airlines fly nonstop between Seattle and St Louis?
The non-stop flights between Seattle and St Louis are .
What’s the earliest departure time from SEA to STL Airport?
The earliest flight leaves SEA at 5:20 am and lands in STL - Lambert St Louis International
What are the airports in St Louis?
STL
Can I make changes to my Seattle to St Louis flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from SEA to STL?
Read the fare rules of the Seattle to St Louis air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from Seattle and St Louis?
operate flights between Seattle and St Louis
How long does a flight from Seattle to St Louis take?
It takes approximately 4 hour to fly non-stop from SEA to STL, which is 1709.07 miles by air.
Which airlines provide the cheapest flights from Seattle (SEA) to St Louis (STL) ?
In the past couple of days, the cheapest tickets to STL from SEA were found on UA : USD 221
Do I need a passport to fly between SEA and STL?
No
What’s the latest departure time from SEA to STL ?
The last flight leaves SEA at 6:58 pm
Seattle (SEA) to St Louis (STL): Airport Information
| Origin Airport | Seattle Tacoma International , Seattle, US |
| Destination Airport | Lambert St Louis International , St Louis, US |
| Distance | 1709 miles |
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